scholarly journals Estimation of Position of On-line Partial Discharge on Hydrogenerator Stator Windings using Acoustic Emission Detection Techniques

2004 ◽  
Vol 124 (7) ◽  
pp. 534-540 ◽  
Author(s):  
Tadamitsu Kaneko ◽  
Akito Takemura ◽  
Osamu Takenouchi ◽  
Youl-Moon Sung ◽  
Masahisa Otsubo ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Partial Discharge ◽  
Detection Techniques ◽  
Stator Windings ◽  
On Line ◽  
Emission Detection

scholarly journals On-line Partial Discharge Measurement of Hydrogenerator Stator Windings using Acoustic Emission Detection Techniques

2004 ◽  
Vol 124 (2) ◽  
pp. 274-280 ◽  
Author(s):  
Tadamitsu Kaneko ◽  
Akito Takemura ◽  
Osamu Takenouchi ◽  
Youl-Moon Sung ◽  
Masahisa Otsubo ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Partial Discharge ◽  
Discharge Measurement ◽  
Detection Techniques ◽  
Stator Windings ◽  
On Line ◽  
Emission Detection

Partial Discharge Detection Using Acoustic and Optical Methods in High Voltage Power Equipments: A Review

2013 ◽  
Vol 845 ◽  
pp. 283-286 ◽  
Author(s):  
Malik Abdul Razzaq Al Saedi ◽  
Mohd Muhridza Yaacob
Keyword(s):  
Acoustic Emission ◽  
High Voltage ◽  
Power Transformer ◽  
Partial Discharge ◽  
Optical Detection ◽  
Detection Threshold ◽  
Optical Methods ◽  
Detection Methods ◽  
Detection Techniques ◽  
Advantages And Disadvantages

There is a high risk of insulation system dielectric instability when partial discharge (PD) occurs. Therefore, measurement and monitoring of PD is an important preventive tool to safeguard high-voltage equipment from wanton damage. PD can be detected using optical method to increase the detection threshold and to improve the performance of on-line measurement of PD in noise environment. The PD emitted energy as acoustic emission. We can use this emitted energy to detect PD signal. The best method to detect PD in power transformer is by using acoustic emission. Optical sensor has some advantages such as; high sensitivity, more accuracy small size. Furthermore, in on-site measurements and laboratory experiments, it isoptical methodthat gives very moderate signal attenuations. This paper reviews the available PD detection methods (involving high voltage equipment) such as; acoustic detection and optical detection. The advantages and disadvantages of each method have been explored and compared. The review suggests that optical detection techniques provide many advantages from the consideration of accuracy and suitability for the applications when compared to other techniques.

On-line Sizing of Pneumatically Conveyed Particles Through Acoustic Emission Detection and Signal Analysis

2015 ◽  
Vol 64 (5) ◽  
pp. 1100-1109 ◽  
Author(s):  
Yonghui Hu ◽  
Lijuan Wang ◽  
Xiaobin Huang ◽  
Xiangchen Qian ◽  
Lingjun Gao ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Signal Analysis ◽  
On Line ◽  
Emission Detection

scholarly journals Detection of partial discharge acoustic emission in power transformer

2019 ◽  
Vol 9 (6) ◽  
pp. 4573 ◽  
Author(s):  
Yomna Omran Shaker
Keyword(s):  
Acoustic Emission ◽  
Acoustic Wave ◽  
Arrival Time ◽  
Power Transformer ◽  
Partial Discharge ◽  
The Other ◽  
Health Index ◽  
High Attenuation ◽  
Other Hand ◽  
Emission Detection

<span>Partial discharge is one the most important factor that leads to deteroration and failure of the power transformer transformer. Acoustic emission detection is effective method to evaluate the health index of the power transformer.      Using acoustic emission (AE) sensors for partial discharge (PD) measurement is considered as one of the most promising techniques to detect and localize PD activities inside the transformer tank. On the other hand, AE waves suffer from high attenuation and reflections while traveling from the PD source to the AE sensor. The modeling of the AE wave can help to understand the behavior of the AE PD signal during its travel. In this paper, the AE PD signal is assumed to be composed of different frequencies. This work aims to investigate the influence of the frequency value on the attenuation and arrival time of the acoustic wave.</span>

scholarly journals Comparison of Off-line and On-line Measurement of Partial Discharges for Hydrogenerator Stator Windings using Acoustic Emission Sensors

2006 ◽  
Vol 126 (6) ◽  
pp. 578-585
Author(s):  
Tadamitsu Kaneko ◽  
Takashi Ueda ◽  
Osamu Takenouchi ◽  
Masahisa Otsubo ◽  
Chikahisa Honda ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Partial Discharges ◽  
Stator Windings ◽  
Line Measurement ◽  
Acoustic Emission Sensors ◽  
On Line

scholarly journals Comparison of Low and High Frequency Partial Discharge Measurements on Stator Windings

2019 ◽  
pp. 134-138
Author(s):  
Greg C Stone ◽  
Howard Sedding
Keyword(s):  
High Frequency ◽  
Partial Discharge ◽  
Low Frequency ◽  
International Standards ◽  
Very High Frequency ◽  
Stator Windings ◽  
Advantages And Disadvantages ◽  
On Line ◽  
Winding Insulation

Partial discharge (PD) testing has been used for over 60 years primarily as a method to assess condition of the stator winding insulation in motors and generators rated 6 kV and above. More recently it has also been used by some machine manufacturers as a means of assuring the quality of the insulation on single winding elements (coils and bars). Although both on-line and off-line tests mainly use a high voltage capacitor to detect the PD, the PD measuring systems in use work either in the low frequency (LF) regime (less than about 1 MHz) or in the very high frequency (VHF) (30-300 MHz) range. By reference to several international standards, published work as well as some experiments described in this contribution, the advantages and disadvantages of the two approaches are compared. Based on this work, it is now clear that off-line PD tests should be done in the LF range. For on-line tests, either method may be used, but use of the VHF method has become more widespread with machine end users, since the owners themselves can perform and interpret the results with a relatively low risk of false indications.

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